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array 1. concat() is used to connect two or more arrays and return a new array (without changing the original array) let arr1=[1,2,3,4] let arr2=[5,6] console.log(arr1.concat(arr2))//[1,2,3,4,5,6] 2. pop() is used to delete and return the last element of the array (changing the original array) let arr=[1,2,3,4] let res=arr.pop() console.log ...

First, exception handling belongs to the spring MVC module, not the spring core. Having this awareness can help us better understand the spring framework. There are two spring MVC unified exception handling mechanisms. The first is to implement the HandlerExceptionResolver interface. The second is to add @ ControllerAdvice annotation on the exc ...

         After selecting the architecture and setting the super parameters, we enter the training stage. Our goal is to find the parameter value that minimizes the loss function. After training, we need to use these parameters to make future predictions. Sometimes we need to extract parameters to reuse th ...

Problem description Give you an array of n integers, nums, and a target value, target. Please find and return the quads [nums[a], nums[b], nums[c], nums[d]]: 0 <= a, b, c, d < n a. b, c and d are different from each other nums[a] + nums[b] + nums[c] + nums[d] == target You can return answers in any order. Example 1: Input: num = [1 ...

Work hard and see you at the top! come on. 1, Set interface 1. Introduction to set interface Out of order (the order of addition and extraction is inconsistent) and there is no indexDuplicate elements are not allowed and contain at most one null 2. Traversal mode iterator Enhanced for loop (the underlying is also an iterator)Cannot g ...

background         In the project, I used a hook function of windows, mainly the keyboard hook, which is very interesting. So I want to see the hook function under linux and realize a function of monitoring keyboard input, so that I can shield the input of some keys. process         I only have a ...